util: mark iterator entries as such
It is possible to distinguish the entries iterator from others. Expose that information to the users as well and improve the Symbol.toStringTag handling by adding a special tag instead of replacing the existent information.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines